|
Résumé |
The renormalization group (RG) has been introduced in its modern form by K.G. Wilson in the seventies, based on the concept of block spin of L.P. Kadanoff. Although nonperturbative in essence the RG has been, for a long time, confined to the perturbative domain: small coupling constant, small disorder, vicinity of the upper or lower critical dimension, etc
In the nineties, C. Wetterich has introduced a new formulation of the RG, based on the concept of running Gibbs free energy, that turns out to be the most suitable one to tackle with nonperturbative issues: strong coupling behaviour, physics far from the upper or lower critical dimensions, physics of topological excitations, bound states, disorder, etc
In the first part of my talk I present the general principles of the method. In the second part I illustrate these principles in the context of the physics of polymerized phantom membranes in two dimensions. |
